Abstract

The principle and applications of a new single crystal X-ray camera designed for the Guinier method are reported. Contrary to conventional single-crystal methods using a focusing monochromator, the new camera yields sharp focusing over the entire range of 2θ and an obvious increase in sharpness compared with Guinier powder photographs. Moreover a considerable reduction of the exposure time is attained. Using a single crystal, the clarity of a diffraction pattern may be increased to a considerable degree: by an appropriate choice of crystal position and oscillation angle, it is possible to record only those reflexions of particular interest. Further applications of the camera to small-angle scattering, photography of the mosaic spread and topographical mapping are given.

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